Plastic storage containers represent a significant investment in home organisation. Whether you have spent money on premium food storage systems or economical bulk bins for the garage, proper maintenance will extend their useful life by years and keep them functioning effectively. This comprehensive guide covers everything you need to know about cleaning and caring for your plastic containers.
Understanding Plastic Types
Not all plastic containers are created equal, and understanding the type of plastic you are working with helps determine the best cleaning approach. Most containers are made from polypropylene (PP, recycling code 5) or high-density polyethylene (HDPE, recycling code 2). These plastics are durable, food-safe, and can withstand reasonable temperature variations.
Cheaper containers may use lower-grade plastics that are more prone to staining, absorbing odours, and becoming brittle over time. Premium containers often use materials like Tritan copolyester, which resists staining and cloudiness better than standard plastics.
Check the recycling symbol on the bottom of your containers to identify the plastic type. This information also helps determine microwave and dishwasher safety.
Routine Cleaning Methods
For everyday cleaning, most plastic containers can be washed with warm water and standard dishwashing liquid. Use a non-abrasive sponge or cloth to avoid scratching the surface. Scratched plastic becomes more porous and is harder to clean thoroughly.
Hand Washing Technique
Fill the container with warm water and add a small amount of dishwashing liquid. Let it soak for a few minutes to loosen any residue, then wash with a soft sponge. Pay particular attention to corners and the underside of lids where food particles accumulate.
Rinse thoroughly with clean water. Soap residue left on containers can transfer to food and may contribute to cloudiness over time. Allow containers to air dry completely before stacking and storing.
Dishwasher Cleaning
Many modern containers are dishwasher safe, but always check the manufacturer's instructions. Generally, containers should be placed on the top rack only, as the heating element on the bottom of dishwashers can warp plastic.
Use the normal cycle rather than heavy-duty settings with extremely high temperatures. Over time, repeated exposure to very hot water can cause plastic to become brittle and crack.
Some experts recommend occasionally hand washing even dishwasher-safe containers. The gentler cleaning method helps preserve the container's structural integrity and surface finish.
Removing Stubborn Stains
Tomato-based sauces, curries, and other strongly coloured foods often leave stains on plastic containers. While these stains are usually cosmetic and do not affect food safety, many people prefer their containers to look clean.
Baking Soda Paste
Create a paste using baking soda and a small amount of water. Apply this paste to the stained areas and let it sit for fifteen to thirty minutes. Gently scrub with a soft brush or cloth, then rinse thoroughly.
For severe stains, you can leave the paste on overnight. The mild abrasive action of baking soda helps lift stains without scratching the plastic surface.
Sunlight Method
Ultraviolet light naturally breaks down the compounds that cause many food stains. After washing the stained container, place it in direct sunlight for several hours. The Australian sun is particularly effective for this method.
Be aware that prolonged sun exposure over time can make plastic brittle, so this should be an occasional treatment rather than a regular drying method.
Vegetable Oil Treatment
For some stains, particularly those from tomato-based products, a small amount of vegetable oil can help. Apply oil to the stain, let it sit for a few minutes, then wash as normal. The oil helps release the stain-causing compounds from the plastic surface.
Eliminating Odours
Plastic is porous at a microscopic level, which means it can absorb and retain odours from strongly scented foods. Garlic, onions, fish, and certain spices are common culprits.
Baking Soda Soak
Baking soda is excellent for neutralising odours. Add two tablespoons of baking soda to the container, fill with warm water, and seal the lid. Shake well and leave overnight. Rinse thoroughly the next day.
For lids, which often retain more odour than containers, soak them separately in a baking soda solution.
Vinegar Solution
White vinegar is another effective odour neutraliser. Fill the container with a solution of one part vinegar to four parts water. Let it soak for several hours, then wash with soap and water. The vinegar smell will dissipate as the container dries.
Newspaper Method
For containers that will be stored empty for extended periods, place crumpled newspaper inside before sealing. The newspaper absorbs residual odours. Replace the newspaper every few weeks until odours are eliminated.
Preventing Damage
Proper use and storage habits significantly extend container life.
Temperature Management
Avoid subjecting containers to extreme temperature changes. Placing a container from the freezer directly into the microwave, or vice versa, can cause cracking. Allow containers to gradually adjust to temperature changes.
Never use plastic containers in conventional ovens unless specifically rated for this purpose. Even microwave-safe containers should not be heated empty.
Stacking and Storage
Stack containers properly to prevent warping. Nesting containers of similar sizes together reduces stress on the material. Store lids separately or loosely attached to prevent seals from compressing permanently.
Keep containers away from heat sources during storage. The cupboard above the stove, for instance, is not an ideal location due to rising heat from cooking.
Seal Maintenance
Container seals are often the first component to fail. Clean seals carefully, ensuring no food particles are trapped in grooves. Some seals can be removed for thorough cleaning.
If a seal becomes stretched or damaged, check whether replacement seals are available from the manufacturer. A failing seal can be the difference between containers that keep food fresh and those that do not.
When to Replace Containers
Despite best maintenance, plastic containers have a limited lifespan. Replace containers that show:
Deep scratches or gouges that could harbour bacteria and are difficult to clean properly. Warping or deformation that prevents proper sealing. Cracked or damaged seals that no longer create airtight closure. Persistent odours or stains that cleaning cannot remove. Cloudiness or discolouration that suggests material degradation.
For food storage containers, replacement every three to five years is generally recommended, even if visible damage is not apparent.
Environmental Considerations
When replacing containers, dispose of old ones responsibly. Check whether your local council accepts the specific plastic type in kerbside recycling. Many councils have restrictions on which plastics they can process.
Consider donating still-functional containers to charity organisations. Containers unsuitable for food can still be useful for storing craft supplies, hardware, or other household items.
By following these maintenance practices, you will keep your plastic storage containers clean, fresh, and functional for years to come.
Key Takeaways
- Start with small, manageable areas to build momentum and confidence.
- Choose storage solutions appropriate for Australian climate conditions.
- Maintain your systems with regular upkeep rather than occasional overhauls.